Diverting, altering or abandoning a public sewer


If you want to improve or develop land that you own, and the public sewerage would likely stop or hinder your development, then you have the right to request its alteration or removal. However, this does not apply to any sewers on a public highway or road.

Once we’ve received your expression of interest form, we will review your requirements and we will issue you with a follow up email with the application pack attached. Please complete the application form and return it to us by sending it to developer.services@dwrcymru.com along with all of the requested supporting documentation.

Once we’ve got all the information we need, our engineers will then consider your request and let you know whether we agree with your suggestion within 28 working days.

If you aren’t sure how to fill out either the expression of interest form, application form or have any questions, take a read of our guidance notes.

How much will it cost?

  • There's no upfront cost for applying for this service. As every case is different, one of our engineers will be able to calculate the cost of the work for your application once it's been vetted and approved. The fee is derived from the cost of the construction works to divert the sewer so it is important that a cost estimate is provided. 
  • View our Schedule of Charges for more information on how the fee for the sewer diversion is calculated
  • You’ll only need to pay once an engineer has approved the sewer diversion design

Important note

  • In line with the Water Industry Act 1991, we have a duty to consider all reasonable requests for diversion.
  • However, a diversion which would mean that the public sewer would be unusable, inaccessible or see its performance reduced would typically be considered unreasonable.